freetdm: add logging when failing to read a frame in mod_freetdm

diff --git a/libs/freetdm/mod_freetdm/mod_freetdm.c b/libs/freetdm/mod_freetdm/mod_freetdm.c
index 2b50d75b6935db0f25f2a484390e87e4a32e7aa7..d2c142e7ffd5bbf104f021e4602e1e4465a5a76a 100644 (file)
--- a/libs/freetdm/mod_freetdm/mod_freetdm.c
+++ b/libs/freetdm/mod_freetdm/mod_freetdm.c
@@ -603,6 +603,7 @@ static switch_status_t channel_read_frame(switch_core_session_t *session, switch
        assert(tech_pvt != NULL);
 
        if (switch_test_flag(tech_pvt, TFLAG_DEAD)) {
+               ftdm_log(FTDM_LOG_DEBUG, "TFLAG_DEAD is set\n");
                return SWITCH_STATUS_FALSE;
        } 
 
@@ -636,6 +637,7 @@ static switch_status_t channel_read_frame(switch_core_session_t *session, switch
        }
        
        if (!switch_test_flag(tech_pvt, TFLAG_IO)) {
+               ftdm_log(FTDM_LOG_DEBUG, "TFLAG_IO is not set\n");
                goto fail;
        }
 
@@ -643,6 +645,7 @@ static switch_status_t channel_read_frame(switch_core_session_t *session, switch
        status = ftdm_channel_wait(tech_pvt->ftdmchan, &wflags, chunk);
        
        if (status == FTDM_FAIL) {
+               ftdm_log(FTDM_LOG_WARNING, "failed to wait for I/O\n");
                goto fail;
        }
        
@@ -650,19 +653,21 @@ static switch_status_t channel_read_frame(switch_core_session_t *session, switch
                if (!switch_test_flag(tech_pvt, TFLAG_HOLD)) {
                        total_to -= chunk;
                        if (total_to <= 0) {
+                               ftdm_log(FTDM_LOG_WARNING, "Too many timeouts while waiting for I/O\n");
                                goto fail;
                        }
                }
-
                goto top;
        }
 
        if (!(wflags & FTDM_READ)) {
+               ftdm_log(FTDM_LOG_WARNING, "I/O waiting returned status %d but nothing to read is available\n", status);
                goto fail;
        }
 
        len = tech_pvt->read_frame.buflen;
        if (ftdm_channel_read(tech_pvt->ftdmchan, tech_pvt->read_frame.data, &len) != FTDM_SUCCESS) {
+               ftdm_log(FTDM_LOG_WARNING, "failed to read from device\n");
                goto fail;
        }